The antigen binding site of an antibody is present at

Options

A. the constant region
B. the C- terminal
C. the variable region
D. between constant and variable region.

Answer

C

Explanation

Antibodies are made up of four polypeptide chains two heavy and two light chains. Light and heavy chains are subdivided into variable and constant regions. The variable portion is used for binding to antigen and a constant portion determines its adherence and diffusivity.